Environmental sustainability: Abatement of Co₂ emissions from a calcination plant in Zimbabwe

A small calcination company is starting up in Zimbabwe. The main challenge at the company is the abatement of Carbon Dioxide (CO₂) emissions. There are 2x3 tonne kilns that have just started operating and are releasing flue gases directly into the air. Data was collected through visits to the calcination plant and interviews of key personnel. Research into how CO₂ can be removed from the flue gas before it can be released into the air was carried out with specific reference to the plant. The results showed that environmental sustainability is achievable by minimising the emissions of CO₂ into the environment and reducing energy and material inputs. Addition of chimneys to the kilns will increase draught column and preheating of limestone hence raw materials utilisation will improve. Addition of an exhaust will make collection of CO₂ more convenient. As the flue gas is collected it is made to pass through an amine system that then captures CO₂. The collected CO₂ will be sold to companies that use it as a raw material. Addition of vermiculite insulating material between the brick layers will improve insulation and energy is utilised. Steel reinforcements to the kilns will extend their life span as well.